Limitations encountered for the treatment of a low C:N waste using a modified membrane-aerated biofilm reactor

Nicholas C. Landes, W. Andrew Jackson, Audra N. Morse

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5 Scopus citations

Abstract

A modified membrane-aerated biofilm reactor (mMABR) that combined oxygen permeable membranes and inert attachment media to support both nitrification and denitrification was used to treat a carbon-limited (COD:N 5 1.8) and ammonium-rich (NH4+ 5 650 g-N/m3) space habitation waste stream. An eight-fold increase in intramembrane air pressure did not affect process performance; however, for an air pressure of 11 kPa (gauge), lower and upper hydraulic loading limits for the mMABR were identified at 30 g-N/m3·d and 123 g-N/m3·d, respectively. Oxygen limitation occurred at the highest loading rate and alkalinity limitation occurred at the lowest loading rate. Partial nitrification was noted at both limitations. Additionally, increased recirculation ratios were shown to decrease denitrification efficiency. Mean carbon and nitrogen removal rates were as high as 75.3 g-C/m3·d (0.26 g-C/m 2·d) and 63.8 g-N/m3·d (0.22 g-N/m 2·d), respectively. The mMABR achieved maximal nitrification and denitrification performance given the stoichiometric nature of the waste.

Original languageEnglish
Pages (from-to)128-139
Number of pages12
JournalWater Environment Research
Volume83
Issue number2
DOIs
StatePublished - Feb 2011

Keywords

  • Hybrid reactor
  • Low C/N waste
  • Membrane-aerated biofilm reactor
  • Partial nitrification
  • Simultaneous nitrification/denitrification

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